You need to have the RSView Machine addition, also I believe that copying the APA file will probably not load into ME, you have to use the utility to register it in the ME file system, Rockwell have really been naughty, firstly it appears that ME is an upgrade of the old RSView32 Scada, costs a great deal of money, you have to register or unpack the compacted code to view it in ME, however later versions were able to open & convert the MER file back to source code, I'm surprised you do not have the MER file as this can be copied from the panelview to SD card and restored if you need to replace the PV.